how to get count of no.of instance

[Sameer Modak]

Hello Team,

I want to know the no of instance data sending to prometheus. How do i formulate the query .

Basically i have below working query but issues is we have 6  instances hence its summing value of all instances. Instead we just need value from one instance.

sum(kafka_consumergroup_lag{cluster=~"$cluster",consumergroup=~"$consumergroup",topic=~"$topic"})by (consumergroup, topic)

I was thinking to divide it / 6 but it has to be variabalise on runtime

if 3 exporters are running then it value/3 to get exact value.

[Ben Kochie]

You can use the `up` metric

sum(...)

/

count(up{job="kafka"})

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[Sameer Modak]

I tried the same i m not getting any data post adding below 

sum(kafka_consumergroup_lag{cluster=~"$cluster",consumergroup=~"$consumergroup",topic=~"$topic"}) by (consumergroup, topic) / count(up{job="prometheus.scrape.kafka_exporter"})

[Brian Candler]

The labels for the two sides of the division need to match exactly.

If they match 1:1 except for additional labels, then you can use

xxx / on (foo,bar) yyy   # foo,bar are the matching labels

or

xxx / ignoring (baz,qux) zzz   # baz,qux are the labels to ignore

If they match N:1 then you need to use group_left or group_right.

If you show the results of the two halves of the query separately then we can be more specific. That is:

sum(kafka_consumergroup_lag{cluster=~"$cluster",consumergroup=~"$consumergroup",topic=~"$topic"}) by (consumergroup, topic) 

count(up{job="prometheus.scrape.kafka_exporter"})

[Sameer Modak]

Hello Brian,

Actually tried as you suggested earlier but when i execute it says no data . So below are the individual query ss , so if i ran individually they give the output

[Brian Candler]

Those mangled screenshots are no use. What I would need to see are the actual results of the two queries, from the Prometheus web interface (not Grafana), in plain text: e.g.

foo{bar="baz",qux="abc"} 42.0

...with the *complete* set of labels, not expurgated. That's what's needed to formulate the join query.